HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>CSS filter - Grayscale Example</title>
  <style>
    body {
      font-family: sans-serif;
      padding: 1.5rem;
      line-height: 1.6;
    }

    .photo {
      width: min(100%, 280px);
      aspect-ratio: 4 / 3;
      border-radius: 0.5rem;
      background: linear-gradient(135deg, #38bdf8, #a855f7 55%, #f97316);
      filter: grayscale(100%);
      transition: filter 0.3s ease;
      cursor: pointer;
    }

    .photo:hover {
      filter: grayscale(0%);
    }
  </style>
</head>
<body>
  <h1>Grayscale on Hover</h1>
  <p>Hover the box to restore color.</p>
  <div class="photo" role="img" aria-label="Grayscale photo that restores color on hover"></div>
</body>
</html>

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CSS filter Property - Grayscale Hover